XPS studies of Cu incorporation in arsenic chalcogenides

Oxidation of arsenopyrite and deposition of gold on the oxidized surfaces: A scanning probe microscopy, tunneling spectroscopy and XPS study

“…7) also demonstrate noticeably less quantities of oxidized As and Fe species on the leached surfaces than on the surfaces treated electrochemically, whereas the proportion of polysulfide and the surface depletion in As and Fe are greater, especially in the case of ferric chloride solution. The formation of realgar, As 4 S 4 , which would exhibit an As 3d peak at 43.1-43.4 eV and S 2p peak at 162.8-163.1 eV (Pratt and Nesbitt, 2000;Bullen et al, 2003), or orpiment, As 2 S 3 , having the relevant BE of 43.4-43.8 and 162.5-162.7 eV, respectively (Costa et al, 2002;Gheorghiu-de La Rocque et al, 2002), should not be ruled out but seems unlikely (Mikhlin and Tomashevich, 2005). It is worth noting that only 1 min exposure to a ferric nitrate solution results in the surface entirely coated with products (EA-1-3), which mainly consist of Fe(III), As(V), and oxysulfur anions with S atoms in the oxidation states from +2 to +6, according to AFM, XPS, FTIR (not shown in figures) and XANES data (Mikhlin and Tomashevich, 2005).…”

Atomic structure and bonding properties in amorphous Cu (As2S3)1− by ab initio molecular-dynamics simulations

“…It is known that the photodarkening which is normally observed in chalcogenide glasses are suppressed by the addition of metals such as Cu [8], Pb [9] and Sn [10]. However, the precise nature of the mechanism that gives rise to these phenomena still remains elusive [11]. In order to clarify the microscopic mechanism of the above behavior, understanding of the fundamental materials properties is indispensable.…”

Viscosity of Cu (As2Se3)100− supercooled melts

“…There have been a number of studies on Cu-modified arsenic selenide bulk glasses or thin films, such as localized-state distribution [1], XPS study of the Cu incorporation [2,3], optical properties and Raman spectra of photodoped chalcogenide films [4], DC conductivity and thermopower [5]. Other studies have focused on crystallization behavior and glass-forming ability in Cu-As-Se system [6,7].…”